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[http://www.redhat.com/mailman/listinfo/fedora-virt fedora-virt list]. | [http://www.redhat.com/mailman/listinfo/fedora-virt fedora-virt list]. | ||
==== | ==== Distributing I/O Load Among Guests ==== | ||
Dennis J. | |||
asked<ref>http://www.redhat.com/archives/fedora-virt/2009-July/msg00183.html</ref> | |||
"What is the best way to deal with I/O load when running several VMs on a | |||
physical machine with local or remote storage?" "What I'm primarily worried about is the case when several VMs cause disk I/O at the same time." "What is the best way to soften the impact of such a situation?" | |||
[[PasiKärkkäinen|Pasi Kärkkäinen]] | |||
suggested "If the IOS are not split evenly between VMs, you could use some tool like | |||
dm-ioband<ref>http://sourceforge.net/apps/trac/ioband/wiki/dm-ioband</ref> to make sure IOs are split fairly between VMs. Or then get faster disks. Single 15k rpm SAS disk will give you up to 350 | |||
IOPS, so it's 2-3x faster than 7200 rpm SATA." | |||
[[RichardJones|Richard Jones]] | |||
concurred<ref>http://www.redhat.com/archives/fedora-virt/2009-July/msg00188.html</ref> | |||
"For KVM, each VM isn't really any different from a host process, so | |||
you have to deal with them the same way that you'd deal with having | |||
lots of host processes doing I/O. So: lots of spindles, expensive I/O | |||
hardware, etc." | |||
<references /> | <references /> | ||
Revision as of 00:29, 3 August 2009
Virtualization
In this section, we cover discussion of Fedora virtualization technologies on the @fedora-virt, @fedora-xen-list, @libguestfs, @libvirt-list, @virt-tools-list, and @ovirt-devel-list lists.
Contributing Writer: Dale Bewley
Fedora Virtualization List
This section contains the discussion happening on the fedora-virt list.
Distributing I/O Load Among Guests
Dennis J. asked[1] "What is the best way to deal with I/O load when running several VMs on a physical machine with local or remote storage?" "What I'm primarily worried about is the case when several VMs cause disk I/O at the same time." "What is the best way to soften the impact of such a situation?"
Pasi Kärkkäinen suggested "If the IOS are not split evenly between VMs, you could use some tool like dm-ioband[2] to make sure IOs are split fairly between VMs. Or then get faster disks. Single 15k rpm SAS disk will give you up to 350 IOPS, so it's 2-3x faster than 7200 rpm SATA."
Richard Jones concurred[3] "For KVM, each VM isn't really any different from a host process, so you have to deal with them the same way that you'd deal with having lots of host processes doing I/O. So: lots of spindles, expensive I/O hardware, etc."
Fedora Xen List
This section contains the discussion happening on the fedora-xen list.
Virtualization Tools List
This section contains the discussion happening on the virt-tools-list list.
Libguestfs List
This section contains the discussion happening on the libguestfs list.
Libvirt List
This section contains the discussion happening on the libvir-list.
oVirt Devel List
This section contains the discussion happening on the ovirt-devel list.